welcome to the gentoo forums!
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Please give us some more information about your system. What driver did you try to use?
I don't know for sure, but I believe the binary NVIDIA driver is only available for x86/x86_64.
That would mean you can try nouveau, and if that does not work you are stuck with the vesa driver.
Sorry that I cannot be of more help at the moment.

There are no binary drivers for linux/ppc, so you'll have to use nouveau --- unfortunately, I don't have the slightest idea how that performs on ppc with your specific card Also, there is no VESA driver on ppc, just the open firmware framebuffer together with the generic fb Xorg driver. For starters, it would be interesting to see your emerge --info together with the contents of /var/log/Xorg.0.log

welcome to the gentoo forums!
You can't upload images to f.g.o.. Use an imagehoster like imgur.
Please give us some more information about your system. What driver did you try to use?
I don't know for sure, but I believe the binary NVIDIA driver is only available for x86/x86_64.
That would mean you can try nouveau, and if that does not work you are stuck with the vesa driver.
Sorry that I cannot be of more help at the moment.

Thanks for your help!!!
The kernel of the OS is gentoo-3.2.1-RC , I installed it by using a DVD with "Install-powerpc-minimal-20120617.iso" , I had delete the Mac OS before that . I installed the gentoo-linux as the handbook says , and I compiled the kernel by using "genkernel" .
Does these information help to solve the problem ? Any question, just tell me , my e-mail address is idenbe@sina.cn .
Actually I am a newer to Linux , I don't know how to use nouveau or vesa driver , where should I configure it ? can you give me the details?
can you give me your e-mail ? I will post you the picture of my desktop ._________________Where there is a shell , there is a way...

There are no binary drivers for linux/ppc, so you'll have to use nouveau --- unfortunately, I don't have the slightest idea how that performs on ppc with your specific card Also, there is no VESA driver on ppc, just the open firmware framebuffer together with the generic fb Xorg driver. For starters, it would be interesting to see your emerge --info together with the contents of /var/log/Xorg.0.log

Yeah , I am a starter , now I know that I have only two choises , the nouveau and vesa driver , but I just don't know where and how to use them.
I can login the desktop , the only problem is the colour of desktop , it is awful ...
I will try to do it , but I think I don't think I can make it without your helps , because I had google it for several days...
Anyway , thanks !_________________Where there is a shell , there is a way...

As I already said, VESA is _no_ option on a powerpc. VESA is the name of a set of graphics routines provided by the video BIOS of the graphics card; the VESA driver utilizes those. On ppc based macs, there is no BIOS, and the corresponding functionality is provided by the so-called open firmware. Again, open firmware provides graphics functionality, and the in-kernel open firmware framebuffer driver uses this to provide a graphical framebuffer. On top of this, you can run xorg using the fbdev driver.

The two other (and considerably faster) options are:

- nouveau: reverse engineered opensource driver, provides 3D acceleration. I have no idea how it performs on macs.

- nv: the "official" nvidia opensource driver. No 3D acceleration and not developed anymore, superseded by nouveau. However, this driver is still part of xorg and might be easier to get to work.

In order to help you getting any of those things working properly, we need your emerge --info output, the contents of /var/log/Xorg.0.log and also your kernel configuration. This way, we can determine your current configuration and help you modify it.

EDIT: I just realized that you propably misunderstood the term for "starters": it means "to begin with" and does not refer to you being a starter Also, don't try to discuss this via email, that's what the forum is for. This way, others with similar problems can use the information in this thread.

As I already said, VESA is _no_ option on a powerpc. VESA is the name of a set of graphics routines provided by the video BIOS of the graphics card; the VESA driver utilizes those. On ppc based macs, there is no BIOS, and the corresponding functionality is provided by the so-called open firmware. Again, open firmware provides graphics functionality, and the in-kernel open firmware framebuffer driver uses this to provide a graphical framebuffer. On top of this, you can run xorg using the fbdev driver.

The two other (and considerably faster) options are:

- nouveau: reverse engineered opensource driver, provides 3D acceleration. I have no idea how it performs on macs.

- nv: the "official" nvidia opensource driver. No 3D acceleration and not developed anymore, superseded by nouveau. However, this driver is still part of xorg and might be easier to get to work.

In order to help you getting any of those things working properly, we need your emerge --info output, the contents of /var/log/Xorg.0.log and also your kernel configuration. This way, we can determine your current configuration and help you modify it.

EDIT: I just realized that you propably misunderstood the term for "starters": it means "to begin with" and does not refer to you being a starter Also, don't try to discuss this via email, that's what the forum is for. This way, others with similar problems can use the information in this thread.

I just want say---Thanks!
And I am sorry too, I am a little busy last month.
There are the out put of emerge --info:

As I already said, VESA is _no_ option on a powerpc. VESA is the name of a set of graphics routines provided by the video BIOS of the graphics card; the VESA driver utilizes those. On ppc based macs, there is no BIOS, and the corresponding functionality is provided by the so-called open firmware. Again, open firmware provides graphics functionality, and the in-kernel open firmware framebuffer driver uses this to provide a graphical framebuffer. On top of this, you can run xorg using the fbdev driver.

The two other (and considerably faster) options are:

- nouveau: reverse engineered opensource driver, provides 3D acceleration. I have no idea how it performs on macs.

- nv: the "official" nvidia opensource driver. No 3D acceleration and not developed anymore, superseded by nouveau. However, this driver is still part of xorg and might be easier to get to work.

In order to help you getting any of those things working properly, we need your emerge --info output, the contents of /var/log/Xorg.0.log and also your kernel configuration. This way, we can determine your current configuration and help you modify it.

EDIT: I just realized that you propably misunderstood the term for "starters": it means "to begin with" and does not refer to you being a starter Also, don't try to discuss this via email, that's what the forum is for. This way, others with similar problems can use the information in this thread.

As I already said, VESA is _no_ option on a powerpc. VESA is the name of a set of graphics routines provided by the video BIOS of the graphics card; the VESA driver utilizes those. On ppc based macs, there is no BIOS, and the corresponding functionality is provided by the so-called open firmware. Again, open firmware provides graphics functionality, and the in-kernel open firmware framebuffer driver uses this to provide a graphical framebuffer. On top of this, you can run xorg using the fbdev driver.

The two other (and considerably faster) options are:

- nouveau: reverse engineered opensource driver, provides 3D acceleration. I have no idea how it performs on macs.

- nv: the "official" nvidia opensource driver. No 3D acceleration and not developed anymore, superseded by nouveau. However, this driver is still part of xorg and might be easier to get to work.

In order to help you getting any of those things working properly, we need your emerge --info output, the contents of /var/log/Xorg.0.log and also your kernel configuration. This way, we can determine your current configuration and help you modify it.

EDIT: I just realized that you propably misunderstood the term for "starters": it means "to begin with" and does not refer to you being a starter Also, don't try to discuss this via email, that's what the forum is for. This way, others with similar problems can use the information in this thread.

Because I just know a little about the kernel config , so I compiled the kernel by using "genkernel" as the handbook says , and do nothing about the kernel._________________Where there is a shell , there is a way...

It seems that you have "nv" and "fbdev" in your VIDEO_CARDS (in make.conf). According to your xorg log, nv tries to load, but fails due to a kernel module claiming the video card (most likely the nouveau module). After that, fbdev loads and drives the screen. Can you post the output of "lsmod" and of "cat /proc/fb"?